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→Frequencies and channels
==Frequencies and channels==
==Frequencies and channels==
CB radio frequencies run between 26.965 MHz and 27.405 MHz. They are organized into 40 "channels." Channel 9 is reserved for emergency communications and traveler's assistance.<ref>"[http://www.reactintl.org/rules-cb.htm FCC Rules for CB Radio]" on REACT Web site</ref>
CB radio frequencies run between 26.965 MHz and 27.405 MHz. They are organized into 40 "channels." Channel 9 is reserved for emergency communications and traveler's assistance.<ref>"[http://www.reactintl.org/rules-cb.htm FCC Rules for CB Radio]" on REACT Web site</ref>
CB originally had 23 channels. At the height of the popularity of CB in the 1970s, the band was expanded to 40 channels, taking effect in 1977. The FCC dropped its requirement that CB operators be licensed in 1980, which was widely ignored anyway.
Channel 19 is the most popular channel among truck drivers, but there are exceptions in some geographic locations and highways (for example, channel 17 on Interstate 5 on the U.S. West Coast).
==REACT==
==REACT==